The length-given link, velocity-given link, position control and change-over link of cutting head and fixed length cutting have been emphatically analyzed and worked out.

重点拟定和分析了切头和定尺剪切的长度给定环节、速度给定环节、位置控制和切换环节。

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Change in position, for example, of limb over time.

位置的改变，比如，肢体随时间进行位置改变。

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The filtering channels of single-plate double-position unit may work alternately, contributing to quick screen change-over , easy production and simple maintenance.

单板双工位过滤通道交替工作，换网迅速，便于生产及维护。

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The plates change size and position over time, moving at speeds of between 1cm and 10cm every year - about the speed at which fingernails grow.

BBC: The Pacific 'Ring of Fire'